问题 解答题
计算下面各题,怎样算简便就怎样算.
(1)
5
6
+
3
11
+
5
11
+
1
6

(2)
6
7
+
1
4
-
9
14

(3)51.27-8.66-1.34
(4)32.5÷(0.05×50)
(5)
1
2
+
1
6
+
1
12
+
1
20

(6)
4
5
-(
2
3
-
1
2
)
答案

(1)

5
6
+
3
11
+
5
11
+
1
6

=(

5
6
+
1
6
)+(
3
11
+
5
11
),

=1+

8
11

=1

8
11

(2)

6
7
+
1
4
-
9
14

=

24
28
+
7
28
-
18
28

=

13
28

(3)51.27-8.66-1.34

=51.27-(8.66+1.34),

=51.27-10,

=41.27;

(4)32.5÷(0.05×50)

=32.5÷

5
2

=

65
2
×
2
5

=13;

(5)

1
2
+
1
6
+
1
12
+
1
20

=(

6
12
+
2
12
+
1
12
)+
1
20

=

3
4
+
1
20

=

4
5

(6)

4
5
-(
2
3
-
1
2
)

=

4
5
-
1
6

=

19
30

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